[ath9k-devel] Cryptography of ath9k driver

Thanks for response.

Well, I mean, are those hardware cryptography and nohwcrypt modparam
applying only to management frames (i.e., are data frames already being
en/decrypted by using software cryptography in mac/ieee80211 kernel module?)

Regards,
Jeon.


On Wed, Oct 26, 2016 at 7:38 PM, Janusz Dziedzic <[email protected]>
wrote:

>
>
> On 26 October 2016 at 08:53, Jeon <[email protected]> wrote:
>
>> I am investigating how ath9k performs cryptography.
>>
>> In slide 15 of DEFCON conference 2014 (link
>> <https://docs.google.com/presentation/d/1CofNlbHs2bLdJuW3VACzAImqesGQoktUTXS6zKgDDKI/edit#slide=id.g371192f19_070>),
>> it says, ath9k performs cryptography a on software side.
>>
>> On the other hand, when I look into ath9k source codes, I found
>> somethings like below:
>>
>> ath9k/common.c:162-166:
>>
>>     if (ah->sw_mgmt_crypto_rx &&
>>   (rxs->flag & RX_FLAG_DECRYPTED) &&
>>   ieee80211_is_mgmt(fc))
>>   /* Use software decrypt for management frames. */
>>   rxs->flag &= ~RX_FLAG_DECRYPTED;
>>
>> As I understand, ath9k can choose hw/sw cryptography for management
>> frames. However, what about data frames? I couldn't find any clue about
>> cryptography for data frames.
>>
>> Can I take it as ath9k already performs software cryptography for data
>> frames and shifts the responsibility of cryptography to mac80211 driver?
>> And exceptionally for management frames, can ath9k choose hw/sw
>> cryptography?
>>
>>
> modinfo ath9k (check nohwcrypt param)
>
> BR
> Janusz
>
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